1,225
1,225 is a composite number, odd, a calendar year.
Historical context — 1225 AD
Calendar year
Year 1225 (MCCXXV) was a common year starting on Wednesday of the Julian calendar.
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Year facts
- Year type
-
Common year
Standard 365-day year; not divisible by 4 (or divisible by 100 but not 400).
- Days in year
- 365
- ISO weeks
- 52
- Started on
-
Wednesday
January 1, 1225
- Ended on
-
Wednesday
December 31, 1225
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
1220s
1220–1229
- Century
-
13th century
1201–1300
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
801
801 years before 2026.
In other calendars
- Hebrew
-
4985 / 4986 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
621 / 622 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Wood zodiac:Rooster
Sexagenary cycle position 22 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1768 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
603 / 604 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1217 / 1218 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1147 / 1146 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Odd
- Digit count
- 4
- Digit sum
- 10
- Digit product
- 20
- Digital root
- 1
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 5,221
- Recamán's sequence
- a(8,538) = 1,225
- Square (n²)
- 1,500,625
- Cube (n³)
- 1,838,265,625
- Square root (√n)
- 35
- Divisor count
- 9
- σ(n) — sum of divisors
- 1,767
- φ(n) — Euler's totient
- 840
- Sum of prime factors
- 24
Primality
Prime factorization: 5 2 × 7 2
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand two hundred twenty-five
- Ordinal
- 1225th
- Roman numeral
- MCCXXV
- Binary
- 10011001001
- Octal
- 2311
- Hexadecimal
- 0x4C9
- Base64
- BMk=
- One's complement
- 64,310 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋 𒌋𒌋𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓎆𓎆𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ασκεʹ
- Mayan (base 20)
- 𝋣·𝋡·𝋥
- Chinese
- 一千二百二十五
- Chinese (financial)
- 壹仟貳佰貳拾伍
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,225 = 0
- e — Euler's number (e)
- Digit 1,225 = 2
- φ — Golden ratio (φ)
- Digit 1,225 = 3
- √2 — Pythagoras's (√2)
- Digit 1,225 = 2
- ln 2 — Natural log of 2
- Digit 1,225 = 9
- γ — Euler-Mascheroni (γ)
- Digit 1,225 = 4
Also seen as
UTF-8 encoding: D3 89 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.201.
- Address
- 0.0.4.201
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.4.201
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1225 first appears in π at position 9,416 of the decimal expansion (the 9,416ordinal-suffix:th digit after the integer 3).
Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.